body{
    background-color: #ccc;
}
#box{
    width: 280px;
    height: 160px;
    position: absolute;
    background-color: #aaa;
    border: 1px solid #fff;
}
.box{
    border: 2px dashed #000;
    position: absolute;
}
#div{
    height: 30px;
    background-color: #222222;
    border: 1px solid #fff;
    cursor: pointer;
}
#ul{
    list-style: none;
    margin: 0;
    padding: 0;
}

#btn{
    float: right;
    line-height: 30px;
    background: none;
    border: none;
    outline: none;
    color: #fff;
}

#ul span{
    display: block;
    width: 100px;
    margin-top: 10px;
    margin-left:10px;
    float: left;
    font-weight: 700;
    color: #fff;
}
#ul li{
    display: block;
    width: 100px;
    margin-top: 10px;
    float: left;
    color: #000;
}